Question 1182177: Twelve different video games showing substance use were observed and the duration of times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct a 90% confidence interval estimate of o, the standard deviation of the duration times of game play. Assume that this sample was obtained from a population with a normal distribution.
4133, 4408, 4021, 4820, 4720, 4635, 5007, 4568, 4192, 3961, 4897, 4223
What is the confidence interval of population mean?
The confidence interval estimate is ____ sec < o < ____ sec
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! The mean is 4465.42 seconds
the sd is 357.85 seconds
sample size is 12
90%CI (seconds) is t(0.95, df=12)*s/sqrt(n)
=1.796*357.85/sqrt(12)
=185.53
the interval is 4465.42+/-185.53
or (4279.9, 4651.0) seconds
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